Dieppe's port is equipped with a RONIM tide-gauge since february 2009. The observatory is managed by the SHOM in partnership with the Joint Associationof the Port ofDieppe.

The Dieppe tidal observatory is located at the Eastern end of the Quai Henri IV in the port of Dieppe. Various tide gauges have been fitted over the years: - BRILLE 2A float type tide gauge N°2701 (1949-1988) - OTT R16 float type tide Gauge (January 1989 to February 2009) The tide gauge was installed on 29 January 1989 and was operated by the Service Maritime du Port de Dieppe. - RONIM digital coastal tide gauge (February 2009-...) The present tide gauge was installed by SHOM from 9 to 13 February 2009, in partnership with the Syndicat Mixte du port de Dieppe. A Khrone Optiflex radar telemeter is now installed in the tide gauge unit. It replaced the float type tide gauge operated up until then by the port. The tide gauge transmits its data in real-time via the Internet.